JPH0326693A - Safety device for escalator - Google Patents

Abstract

PURPOSE:To eliminate action, caused by mischief or the like, by suspending a plurality of cord units in a triangular part, formed in a crossing corner part between the upper edge of an escalator moving handrail and the upper part story floor, mounting a pressure-sensing element respectively to each cord unit and connecting an accident detecting circuit to these pressure-sensing elements. CONSTITUTION:When a contact pressure is received successively to three of the cord units 5 by an accident, each pressure sensing element 9 of these cord units is turned on, and an output is generated for two seconds respectively through one-shot multivibrators 11. In this way, three transistors 12 are simultaneously conducted with their output 0, accordingly an output of NOT circuits 13 is respectively 1, and because an output of AND circuits 14 is 1, an output of an OR circuit 15 obtains 1 to conduct a transistor 17 with a perfect circuit 16 energized, thus an escalator is stopped. That is, when the contact pressure is simultaneously received by at least some three of the plurality of cord units 5, an accident detecting circuit 10 is energized, but even when the contact pressure is carelessly applied to 1 to 2 cord units 5, the circuit 10 is not energized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is designed to prevent pinching accidents that are likely to occur at the triangular portion formed at the intersection corner between the upper edge of the escalator handrail and the upper floor. This relates to safety devices for escalators.

[Conventional technology]

Conventionally, as shown in Figure 5, escalator steps (1)
The moving handrail (2) that transitions on both sides of the railing and the upper floor (3)
) A triangular protection plate (4) is suspended from the corner where the triangle crosses the triangle to prevent pinching accidents that often occur in this area. However, simply providing such a protective plate (4) will still cause accidents, so measures such as detecting the displacement of the protective plate (4) and the pressing force applied thereto will stop the escalator. A number of proposals regarding safety devices have already been made (JP-A-58-16770, JP-A-57-191771).

[Problem to be solved by the invention]

Conventional escalator safety devices detect the displacement of the protective plate (4) as described above, for example.
4) Inadvertent contact or mischievous contact, etc., could also be detected, and there was a risk that the escalator would frequently come to a sudden stop each time. Therefore, although there is a demand for the installation of a safety device itself, the reality is that it has not been put into practical use due to the insufficient accident detection function.The present invention was created in view of these conventional drawbacks. The purpose is to provide a safety device for escalators that has a reliable detection function that eliminates operations caused by tampering. (Means for solving the i! problem) In order to achieve the above object, the present invention suspends a plurality of strings from the triangular part formed at the intersection corner between the upper edge of the escalator handrail and the upper floor. A pressure-sensitive element is attached to each of the strings, and a pressure-sensitive element is attached to each of the strings, and a predetermined number of pressure-sensitive elements are attached to the string when the pressure is applied to the string. An accident detection circuit that de-energizes the escalator drive source when the escalator is activated is connected and configured. [Operation] According to the present invention, since the above structure is provided, when a predetermined number, for example, three pressure sensitive elements are electrically connected, that is, when the string 3
The accident detection circuit is activated and the escalator is stopped only when a book is continuously touched. Therefore, it is possible to eliminate malfunctions in which the stopping operation is caused by carelessly or intentionally touching a specific string.

(Embodiment) The present invention will be explained below with reference to the embodiment shown in Figs. A plurality of elastic strings are hung in parallel from the upper floor (3) in the triangular part formed in the hole (6) of the deck board (6) that supports and guides the moving handrail (2). 7) and is connected to a pressure-sensitive element (9) fixed to the bottom of the parapet (8). This pressure-sensitive element (9) consists of an omnidirectional sensing type with a built-in pressurized conductive rubber sensor (cord switch), and each of the above-mentioned strings (5)
The cords (5) are individually attached to the lower ends of the cords (5), and are electrically connected by contact pressure from the outside applied to each cord (5).
When a predetermined number of strings (5), for example, as shown in FIG. 3, any three strings (5) receive contact pressure at the same time, that is, any three pressure-sensitive elements An accident detection circuit (lO) illustrated in FIG. 4 is connected to these pressure sensing elements (9) so as to deenergize the escalator drive source when the pressure sensing elements (9) are simultaneously made conductive. That is, in FIG. 4, (11) represents each pressure sensitive element (9).
), when the pressure sensitive element (9) is ON, it sends out an output for, for example, 2 seconds, making the transistor (12) conductive. The output sides of these transistors (12) are sequentially connected to three AND circuits (14) via a NOT circuit (l3), and each AND circuit (
The output side of 14) is connected to the OR circuit (15), and the output side is provided with a transistor (17) that energizes the safety circuit (16) when conductive. Therefore, as shown in FIG.
) turns ON, and the one-shot multi-vibrator (1
Since the output is sent for 2 seconds through 1), 3
The transistors (12) are simultaneously turned on and their outputs become O, so the outputs of the NOT circuits (13) each become 1 and the output of the AND circuit (l4) becomes 1.
becomes. Therefore, the output of the OR circuit (15) becomes 1, the transistor (17) becomes conductive, the safety circuit (16) is energized, and the escalator is stopped. That is, if at least any three of the plurality of strings (5) receive contact pressure at the same time, the accident detection circuit (lO) is energized and stops the escalator, but if one accidentally or intentionally A book or two strings (5)
The ugliness detection circuit (10) will not be energized even if contact pressure is applied to it.

In the above embodiment, the cord (5) is an elastic cord made of rubber or the like, and the pressure-sensitive element (9) at the lower end thereof is fixed to the parapet bottom (8). It is also possible to suspend strings (5) that do not have elasticity and are provided on the floor (3) side in parallel using weights or the like.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an escalator safety device that has a reliable accident detection function that can eliminate malfunctions caused by mischief or the like.

[Brief explanation of drawings]

Fig. 1 is a side view showing the escalator safety device according to the present invention, Fig. 2 is a cutaway front view thereof, Fig. 3 is an explanatory diagram showing accident operation, Fig. 4 is a connection circuit diagram of an accident detection circuit, Figure 5 is an explanatory diagram showing the safety measures of conventional escalator equipment. 1)...Stairs, 2)...Movable handrail, 3)...Upper floor, 5. )... String, 9)... Pressure sensing element, 10)... Accident detection circuit. Note that the same symbols in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] Multiple cords are suspended from the triangular part formed at the intersection corner of the upper edge of the escalator handrail and the upper floor, and pressure conduction is achieved by external contact pressure applied to each of these cords. A pressure sensitive element is attached to each of the assemblies, and an accident detection circuit is connected to each of the pressure sensitive elements, which is energized when a predetermined number of pressure is applied to the elements and deenergizes the escalator drive source. escalator safety device.